Well you just planted the rhizomes....
First there will be root stress, though not great due to the plants just coming out or still in dormancy, never the less it takes time for Sarracenia to acclimate to their new containers. Sarracenia do not like stress or shock and can take a long time to produce fully formed pitchers that are not deformed, and look good.
Maybe you will see some in mid to late May, most likely later this summer with the plant not fully acclimated and growing normal until next spring.
Remember the average Sarracenia produces about 10 leaves per plant per year, this is a average and can be slightly higer with multi growth points.
This is also with a good growing environment (humidity, light, & temp). You can witness some really funky pitchers coming forth without the proper climate for awhile. Also S. leucophylla & its hybrids really don't throw out the best pitchers until late summer into the early winter. They do produce many spear shaped phyllodia leaves without a pitcher at all, very true when stressed such as in a drought, high heat, or root shock.
These guys can and will take there time, I know none of us like that.
If its a plant from a area much different than your local climate it will be harsh. If its a field collected plant it will be a year or more.
Mike
St. Petersburg Florida